diff --git a/lib/tasks/sync_ntnu_personal_data_tasks.rake b/lib/tasks/sync_ntnu_personal_data_tasks.rake
index ded40dd..7e392f0 100644
--- a/lib/tasks/sync_ntnu_personal_data_tasks.rake
+++ b/lib/tasks/sync_ntnu_personal_data_tasks.rake
@@ -35,7 +35,7 @@ module NtnuSyncPlugin
       if invalid_apa_title.include? apa_title
         jp.delete
         jp = JournalPaper.new
-        jp.paper_title_translations = { 'zh_tw' => apa_title, 'en' => apa_title }
+        jp.paper_title_translations = { 'zh_tw' => nil, 'en' => nil }
         jp.year = publication_year
       end
 
@@ -98,7 +98,7 @@ module NtnuSyncPlugin
       if invalid_apa_title.include? apa_title
         wc.delete
         wc = WritingConference.new
-        wc.paper_title_translations = { 'zh_tw' => apa_title, 'en' => apa_title }
+        wc.paper_title_translations = { 'zh_tw' => nil, 'en' => nil }
       end
 
       wc.member_profile_id = user.member_profile_id